Considering the amount of passwords, PINs, and other vital information, such as Social Security numbers, that we have to keep handy it's not surprising that many people write down information like this and keep it on a sticky note or the back of a business card. If you want to keep essential information readily available and yet hard to decipher, consider picking up a UV pen and LED flashlight so you can write down your passwords on any paper source.

This tip originally came from wilderness survival weblog Dirt Time who originally used the idea to keep maps in the car that showed the way to their cabin in the wilderness but didn't want to leave that information for thieves to find. They marked the routes using UV ink and made sure to keep UV flashlights on hand.

This seems like a great solution if you want to keep a written copy of a master password available but somewhat secure. I currently have a my LastPass password written on the back of a business card hidden away in a small firebox just in case I get amnesia or die and my wife or family needs access to my accounts. It would be much more secure to write this info down with a UV pen and tell anyone I'd want to access the information where it is. You can get a UV marker on Amazon for as little as $2.49 and a UV microlight for $7.25, so for right around ten bucks you can add a lot of security.